"stretched out" is a complete myth.
That said, there are some women who prefer big dicks, but it's a personal preference, nothing more.
As for a woman's frame having an effect, I haven't noticed much of a correlation there either. I've been with 5'4" women and 6'3" women and the latter was just as tight as the former... and had two children and 15 years on the 5'4" woman, so...
Stop worrying about your dick so much.
